prometheus-client-derive-encode 0.5.1

Auxiliary crate to derive Encode trait from prometheus-client.
Documentation 
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error: Can not derive Encode for struct with unnamed fields.
 --> tests/build/friendly-compilation-error-msg.rs:6:1
  |
6 | struct Unnamed(String);
  | ^^^^^^^^^^^^^^^^^^^^^^^

error: Can not derive Encode for struct with unit field.
  --> tests/build/friendly-compilation-error-msg.rs:10:1
   |
10 | struct UnitStruct;
   | ^^^^^^^^^^^^^^^^^^

error: Can not derive Encode for enum.
  --> tests/build/friendly-compilation-error-msg.rs:14:1
   |
14 | / enum NotAllowedSet {
15 | |     A,
16 | |     B,
17 | | }
   | |_^

error: Provided attribute 'unknown', but only 'flatten' is supported
  --> tests/build/friendly-compilation-error-msg.rs:22:18
   |
22 |     #[prometheus(unknown)]
   |                  ^^^^^^^

error: Can not derive EncodeLabel for struct.
  --> tests/build/friendly-compilation-error-msg.rs:28:1
   |
28 | struct StructForValue;
   | ^^^^^^^^^^^^^^^^^^^^^^

error: Can not derive Encode for union.
  --> tests/build/friendly-compilation-error-msg.rs:32:1
   |
32 | / union UnionSet {
33 | |     a: u32,
34 | |     b: f32,
35 | | }
   | |_^